:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #222938;
    --muted: #657084;
    --light: #F5F7FB;
    --line: #E4E9F2;
    --card: #FFFFFF;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --shadow: 0 18px 45px rgba(31, 47, 82, .10);
    --radius: 26px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #fff;
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(228,233,242,.8);
}
.nav-container {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 68px;
    gap: 14px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #17213A; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: #17213A;
    border-radius: 12px;
    width: 42px;
    height: 42px;
    font-size: 22px;
}
.main-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 74px;
    display: none;
    flex-direction: column;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 12px;
    box-shadow: var(--shadow);
}
.main-nav.open { display: flex; }
.main-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #4D5870;
    font-weight: 650;
    font-size: 14px;
}
.main-nav a.active, .main-nav a:hover { color: var(--blue); background: #EEF5FF; }
.section { padding: 62px 0; }
.section-title { margin: 0 0 12px; font-size: clamp(28px, 4.5vw, 44px); line-height: 1.22; letter-spacing: -.02em; }
.section-lead { margin: 0 0 26px; color: var(--muted); max-width: 760px; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    color: var(--blue);
    background: #EEF5FF;
    font-weight: 750;
    font-size: 13px;
    margin-bottom: 16px;
}
.gradient-bg { background: var(--gradient); color: #fff; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 28px rgba(41,128,254,.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 18px 34px rgba(41,128,254,.34); }
.connection-workspace-hero {
    padding: 46px 0 44px;
    background: var(--gradient);
    color: #fff;
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero:before,
.connection-workspace-hero:after {
    content: "";
    position: absolute;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: rgba(255,255,255,.16);
    filter: blur(4px);
}
.connection-workspace-hero:before { right: -100px; top: -80px; }
.connection-workspace-hero:after { left: -130px; bottom: -140px; }
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 30px;
    align-items: center;
}
.hero-copy h1 { margin: 0 0 18px; font-size: clamp(36px, 9vw, 68px); line-height: 1.07; letter-spacing: -.05em; }
.hero-copy p { margin: 0 0 22px; color: rgba(255,255,255,.88); font-size: 17px; max-width: 620px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-tags span {
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.26);
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 13px;
}
.workspace-visual {
    position: relative;
    border-radius: 32px;
    padding: 18px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.25);
    box-shadow: 0 30px 70px rgba(27, 36, 72, .24);
}
.workspace-visual img { border-radius: 24px; margin: auto; max-height: 430px; object-fit: contain; }
.status-panel {
    background: rgba(255,255,255,.94);
    color: #25304A;
    border-radius: 22px;
    padding: 16px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,.8);
}
.status-panel.floating { margin-top: 14px; }
.status-row { display: flex; justify-content: space-between; gap: 14px; padding: 9px 0; border-bottom: 1px solid #E8EDF6; font-size: 14px; }
.status-row:last-child { border-bottom: 0; }
.status-row strong { color: #111A30; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #2CCB7F; display: inline-block; margin-right: 8px; }
.quick-task-entries {
    display: grid;
    gap: 16px;
    margin-top: -28px;
    position: relative;
    z-index: 5;
}
.task-card, .capability-card, .info-card, .faq-item, .risk-card, .step-card, .panel-card, .scenario-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: 0 12px 32px rgba(30, 46, 88, .06);
}
.task-card span, .capability-card span { display: inline-flex; color: var(--blue); font-weight: 800; font-size: 13px; margin-bottom: 8px; }
.task-card h3, .capability-card h3, .info-card h3, .risk-card h3, .step-card h3, .panel-card h3, .scenario-card h3 { margin: 0 0 8px; font-size: 21px; line-height: 1.35; }
.task-card p, .capability-card p, .info-card p, .risk-card p, .step-card p, .panel-card p, .scenario-card p, .faq-item p { margin: 0; color: var(--muted); }
.card-link { display: inline-flex; margin-top: 14px; color: var(--blue); font-weight: 800; }
.connection-capability-overview { display: grid; gap: 16px; }
.capability-card.featured { background: linear-gradient(180deg, #FFFFFF 0%, #F1F6FF 100%); }
.split-section, .feature-split {
    display: grid;
    gap: 26px;
    align-items: center;
}
.image-panel {
    background: #F3F7FF;
    border: 1px solid var(--line);
    border-radius: 34px;
    padding: 24px;
    overflow: hidden;
}
.image-panel img { margin: auto; max-height: 420px; object-fit: contain; }
.bullet-list, .check-list { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 10px; }
.bullet-list li, .check-list li {
    position: relative;
    padding-left: 28px;
    color: #3D465B;
}
.bullet-list li:before, .check-list li:before {
    content: "";
    position: absolute;
    left: 0;
    top: .65em;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--blue);
}
.encrypted-tunnel-section .security-grid { display: grid; gap: 16px; margin-top: 20px; }
.security-panel { background: #fff; border-radius: 34px; border: 1px solid var(--line); padding: 24px; box-shadow: var(--shadow); }
.route-optimization-section, .usage-scenarios-section { background: var(--light); }
.route-status { display: grid; gap: 12px; }
.route-status .status-panel { box-shadow: none; border: 1px solid var(--line); }
.device-grid, .data-grid, .scenario-grid, .risk-grid, .faq-grid { display: grid; gap: 16px; }
.data-boundary-section .info-card { border-top: 4px solid var(--blue); }
.connection-checkup-section .diagnostic-grid { display: grid; gap: 16px; }
.process-steps { display: grid; gap: 16px; counter-reset: steps; }
.step-card { position: relative; padding-top: 48px; }
.step-card:before {
    counter-increment: steps;
    content: counter(steps);
    position: absolute;
    top: 18px;
    left: 22px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
    font-size: 13px;
}
.risk-card { border-left: 4px solid var(--blue); }
.cta-section {
    margin: 40px auto 0;
    width: min(1120px, calc(100% - 32px));
    border-radius: 34px;
    padding: 42px 24px;
    text-align: center;
    background: var(--gradient);
    color: #fff;
    overflow: hidden;
}
.cta-section p { color: rgba(255,255,255,.86); margin: 0 auto 22px; max-width: 720px; }
.page-hero {
    background: linear-gradient(180deg, #F4F8FF 0%, #FFFFFF 100%);
    padding: 54px 0 34px;
    border-bottom: 1px solid var(--line);
}
.page-hero h1 { margin: 0 0 12px; font-size: clamp(32px, 7vw, 54px); line-height: 1.15; letter-spacing: -.035em; }
.page-hero p { margin: 0; color: var(--muted); max-width: 780px; }
.content-layout { display: grid; gap: 22px; align-items: start; }
.article-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: 0 12px 32px rgba(30, 46, 88, .05);
}
.article-panel h2 { margin-top: 0; font-size: 26px; }
.article-panel p { color: #4B5568; }
.side-panel {
    background: #F6F8FC;
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 22px;
}
.side-panel a { display: block; color: var(--blue); font-weight: 800; padding: 8px 0; }
.download-page-card {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 34px;
    padding: 28px;
    box-shadow: var(--shadow);
}
.faq-item h2, .faq-item h3 { margin: 0 0 8px; font-size: 20px; }
.site-footer { margin-top: 70px; background: #101827; color: #DDE5F4; padding: 46px 0 0; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 24px; font-weight: 850; color: #fff; margin-bottom: 8px; }
.site-footer p { color: #AEB9CE; margin: 0; }
.site-footer h3 { color: #fff; margin: 0 0 8px; font-size: 16px; }
.site-footer a { display: block; color: #B9C4D7; padding: 5px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 34px; padding: 18px; text-align: center; border-top: 1px solid rgba(255,255,255,.10); color: #AEB9CE; font-size: 14px; }
@media (min-width: 640px) {
    .quick-task-entries, .device-grid, .data-grid, .scenario-grid, .risk-grid, .faq-grid, .process-steps, .encrypted-tunnel-section .security-grid, .connection-checkup-section .diagnostic-grid { grid-template-columns: repeat(2, 1fr); }
    .download-page-card { padding: 40px; }
}
@media (min-width: 920px) {
    .nav-toggle { display: none; }
    .main-nav { position: static; display: flex; flex-direction: row; align-items: center; background: transparent; border: 0; box-shadow: none; padding: 0; gap: 2px; }
    .main-nav a { font-size: 13px; padding: 9px 10px; }
    .connection-workspace-hero { padding: 72px 0 84px; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; gap: 48px; }
    .status-panel.floating { position: absolute; right: 26px; bottom: 26px; width: min(340px, 72%); margin: 0; }
    .quick-task-entries { grid-template-columns: repeat(4, 1fr); }
    .connection-capability-overview { grid-template-columns: repeat(6, 1fr); }
    .connection-capability-overview .capability-card { grid-column: span 2; }
    .connection-capability-overview .capability-card.featured { grid-column: span 3; min-height: 220px; }
    .split-section, .feature-split { grid-template-columns: 1fr 1fr; gap: 42px; }
    .route-status { grid-template-columns: 1fr; }
    .scenario-grid, .risk-grid, .data-grid { grid-template-columns: repeat(3, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 28px; }
    .article-panel { padding: 34px; }
    .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); }
    .section { padding: 76px 0; }
}
@media (min-width: 1120px) {
    .main-nav a { font-size: 14px; padding: 9px 12px; }
}